Find the missing number-pair (?, ?) in the given series.
(2, 3), (3, 5), (5, 7), (7, 11), (11, 13), (?, ?)

Solution

Each pair consists of two consecutive prime numbers, and the second number of a pair becomes the first number of the next. After (11, 13), the next pair is 13 and the prime after it, 17. So the answer is (13, 17).

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Find the missing number-pair (?, ?) in the given series.(2, 3), (3, 5), (5, 7), (7, 11), (11, 13), (?, ?)